Polyacrylamide Blending with Ammonia Borane: A Polymer Supported Hydrogen Storage Composite

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Abstract

A new polymer hydrogen storage composite, polyacrylamide blending with ammonia borane (AB@PAM), was prepared through a simple sol-mixing method. The dehydrogenation kinetics and the possible H2-release pathway of the polymeric composites were investigated. Isothermal gas release and thermogravimetry/mass spectroscopy results demonstrated that the dehydrogenation properties of the AB@PAM have been promoted significantly in contrast to pure ammonia borane (AB), justified by its low onset H2-release temperature of 75 °C without induction period and complete depression of the emission of the boracic impurities. To determine the possible H2-release pathway, X-ray diffraction, Fourier transform infrared, and nuclear magnetic resonance measurements were carried out. It was demonstrated that the enhanced kinetics may owe to the refinement of crystal particles and disruption of the dihydrogen-bonding network of AB after blending, while the entire suppress of boracic impurities and the evolution of ammonia may be due to the interaction between O in the carbonyl groups (C═O) of PAM and B in the AB molecules, which weakens the B–N bonds to release NH3 and subsequently forms B–O bonds to inhibit the emission of boracic impurities. Finally, metal chlorides (CaCl2, MgCl2, and ZnCl2) were introduced to the AB@PAM, which leads to a significant depression of NH3 evolution, thereby enabling the dehydrogenation of the polymeric composite to occur at low temperature with enhanced hydrogen purity.

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